The tick noise that everybody talks about, is that when the car is at idle and you lift the hood and the engine is going tick tick tick tick tick when idling? If so, i think that's normal for these modern engines. When I was shopping for my Stang, the few that I checked out all did this. They were all low mileage preowned cars.
no need to open the hood. its not a consistent tick either. You can hear it with the windows down sitting in the car. That other tick is just the injectors or coils. sounds like a ball bearing dropping into a pan. theres a lot of thread and videos on the noise but no one has been able to fix it or figure out what it is. https://www.youtube.com/watch?v=Hga9tZMtN0g
not my car but this is the noise.